Sounds like a crankshaft position sensor issue...you may be able to just clean it but more than likely it will need replacement which may not be particularly easy...depending on your skill level.
Testimonial: "Thank you it was the crank sensor and now it starts,but still a very hard back fired filled start but after it starts it runs perfectly and more thoughts and thank you for your response!"
SOURCE: head bolt torque specs and timing marcs for a 94 volvo 960 6cyl
you do 14 foot pounds then 45 foot pounds then a 120 degree turn.if aluminum heads are what you have
SOURCE: Radio and Sunroof both stopped working at same time. Fuses in 3 locations all seem to be good.
Not positive it is the same thing, however, when setting up my iPOD adapter to the radio, I made the mistake of not following the instructions to the T, and it caused my sunroof to stop working... after a day (which I later found out gave the system enough time to "reset" and connect), I turned on my stereo, pushed the 3CH to Dolby Surround, and that did the trick. It's been about a year... and I've had no problems with the sunroof!
SOURCE: My 2003 Volvo S80 cruise control workds sporadically.
On my 2002 S80 T6, the problem is the brake booster diaphragm position sensor's failure (Volvo 2002 S80 T6 part #31261486--other years, models might be different). This is essentially a piston-driven potentiometer that tells the cruise control system when you've applied the brakes, signaling it to switch off control of the throttle. It's mounted on the back of the brake booster with a wire circlip. It's not easy to get at, and I had to remove the cross-brace between the shock mounts to get at it more easily. The part's about $90 from online parts sources, more at the dealer, plus my dealer wanted a king's ransom to install, $400, parts and labor! While not easy to get to, it's fairly easy to replace--just BE SURE to pump the brakes a lot, engine off, before removing it so that residual booster vacuum won't **** the rubber o-ring around the sensor's cylindrical body into the booster chamber. Hardest, most aggravating part is removing and replacing that steel circlip that holds the sensor in place. Dropping that little steel band into the back of the engine bay kicks off a whole new adventure!
SOURCE: my 1999 volvo s80 won't start. turn the key
On your year there would be something , like cranking , if the security is set. I would start with checking the fuses and then work my way to the starter relay. then I would go to the starter.
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